It would depend on the deal struck between the owners and the insurors. The insuror will want to do it the cheapest way, but the owners have intangibles that are at risk, intangibles that could end up costing the owner gobs of dough. If the insuror is convinced the Hull is a scrap, (perhaps by a Judge), they will pay up to the limit for a new a/c. RR and Q have an interest in making the outcome as invisible to the public as possible, to what extent depends on their credit line.
The considerations are the same whether agreed to at the outset, or as a result of litigation. The attorney's are drooling as we speak. Vultures can Fly too.
I'm sure it's as Joyce contends, a cracked oil line, nothing to see here, move along.
Briefly, imo, the engines were performing within strict guidelines, as a result of the upcharge via chip and augment to thrust. Any failure of the powerplant when Mx is observed, and operated as speced, falls on the manufacturer. It has been a bad two years for TRENT and RR. Perhaps no more naming engines after rivers.
bear